We're dividing 19974839 by 686 
Let's see how many times 686 fits into 19974839.

Advancing to step 1:
686 can be fit into 1 0 times, resulting in a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 686

Going ahead to step 2:
686 goes into 19 0 times with a remainder of 19.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 19, we get 19.
Append the next digit (9) from the dividend to 19 and continue with: 199 / 686

Let's proceed to step 3:
When dividing 199 by 686, we get 0 with a remainder of 199.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 199 leaves us with 199.
Fetch the next digit (7) from the dividend, attach it to 199 and continue: 1997 / 686

Step 4:
686 can be fit into 1997 2 times, resulting in a remainder of 625.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 1372 from 1997, we get 625.
Fetch the next digit (4) from the dividend, attach it to 625 and continue: 6254 / 686

On to step 5:
6254 divided by 686 is 9 with a remainder of 80.
The number 9 becomes the next digit in our result. 
Result so far: 29.0
Subtracting 6174 from 6254 leaves us with 80.
Bring next digit (8) of the dividend behind the 80 and repeat the process: 808 / 686

Advancing to step 6:
When dividing 808 by 686, we get 1 with a remainder of 122.
Use 1 as the next digit of our solution. 
Result so far: 291.0
The remainder is 122 after subtracting 686 from 808.
Take the next digit (3) from the dividend and append it to 122, then repeat: 1223 / 686

Going ahead to step 7:
If we divide 1223 by 686, we get 1 and a remainder of 537.
Write down 1 as next digit of the result. 
Result so far: 2911.0
Subtracting 686 from 1223 leaves us with 537.
Grab the next digit (9) from the dividend, add it to 537, then carry on: 5379 / 686

Going ahead to step 8:
If we divide 5379 by 686, we get 7 and a remainder of 577.
Record the quotient 7 as the next digit in the result. 
Result so far: 29117.0
If we subtract 4802 from 5379, we get 577.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5770, and continue the process.

Going ahead to step 9:
The number 686 fits into 5770 8 times, leaving a remainder of 282.
Put 8 as the next digit of the answer. 
Result so far: 29117.8
Deduct 5488 from 5770 and we're left with 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

Moving on to step 10:
When dividing 2820 by 686, we get 4 with a remainder of 76.
The number 4 becomes the next digit in our result. 
Result so far: 29117.84
Subtract 2744 from 2820 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Let's proceed to step 11:
If we divide 760 by 686, we get 1 and a remainder of 74.
Use 1 as the next digit of our solution. 
Result so far: 29117.841
Subtract 686 from 760 to get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Step 12:
740 divided by 686 is 1 with a remainder of 54.
The next digit of our result is 1. 
Result so far: 29117.8411
Subtract 686 from 740 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The final outcome is 29117.8411, with a leftover of 0.00054.